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btrfs: abstract out loading the tree root

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We're going to be adding more roots that need to be loaded from the
super block, so abstract out the code to read the tree_root from the
super block, and use this helper for the chunk root as well.  This will
make it simpler to load the new trees in the future.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-12-15 15:40:06 -05:00 committed by David Sterba
parent c2fa821cc9
commit bd676446c1
1 changed files with 46 additions and 35 deletions
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81
fs/btrfs/disk-io.c
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@ -2930,6 +2930,45 @@ out:
return ret;
}
static int load_super_root(struct btrfs_root *root, u64 bytenr, u64 gen, int level)
{
int ret = 0;
root->node = read_tree_block(root->fs_info, bytenr,
root->root_key.objectid, gen, level, NULL);
if (IS_ERR(root->node)) {
ret = PTR_ERR(root->node);
root->node = NULL;
} else if (!extent_buffer_uptodate(root->node)) {
free_extent_buffer(root->node);
root->node = NULL;
ret = -EIO;
}
if (ret)
return ret;
btrfs_set_root_node(&root->root_item, root->node);
root->commit_root = btrfs_root_node(root);
btrfs_set_root_refs(&root->root_item, 1);
return ret;
}
static int load_important_roots(struct btrfs_fs_info *fs_info)
{
struct btrfs_super_block *sb = fs_info->super_copy;
u64 gen, bytenr;
int level, ret;
bytenr = btrfs_super_root(sb);
gen = btrfs_super_generation(sb);
level = btrfs_super_root_level(sb);
ret = load_super_root(fs_info->tree_root, bytenr, gen, level);
if (ret)
btrfs_warn(fs_info, "couldn't read tree root");
return ret;
}
static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
{
int backup_index = find_newest_super_backup(fs_info);
@ -2940,9 +2979,6 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
int i;
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
u64 generation;
int level;
if (handle_error) {
if (!IS_ERR(tree_root->node))
free_extent_buffer(tree_root->node);
@ -2967,29 +3003,13 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
if (ret < 0)
return ret;
}
generation = btrfs_super_generation(sb);
level = btrfs_super_root_level(sb);
tree_root->node = read_tree_block(fs_info, btrfs_super_root(sb),
BTRFS_ROOT_TREE_OBJECTID,
generation, level, NULL);
if (IS_ERR(tree_root->node)) {
handle_error = true;
ret = PTR_ERR(tree_root->node);
tree_root->node = NULL;
btrfs_warn(fs_info, "couldn't read tree root");
continue;
} else if (!extent_buffer_uptodate(tree_root->node)) {
ret = load_important_roots(fs_info);
if (ret) {
handle_error = true;
ret = -EIO;
btrfs_warn(fs_info, "error while reading tree root");
continue;
}
btrfs_set_root_node(&tree_root->root_item, tree_root->node);
tree_root->commit_root = btrfs_root_node(tree_root);
btrfs_set_root_refs(&tree_root->root_item, 1);
/*
* No need to hold btrfs_root::objectid_mutex since the fs
* hasn't been fully initialised and we are the only user
@ -3009,8 +3029,8 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
}
/* All successful */
fs_info->generation = generation;
fs_info->last_trans_committed = generation;
fs_info->generation = btrfs_header_generation(tree_root->node);
fs_info->last_trans_committed = fs_info->generation;
fs_info->last_reloc_trans = 0;
/* Always begin writing backup roots after the one being used */
@ -3594,21 +3614,12 @@ int __cold open_ctree(struct super_block *sb, struct btrfs_fs_devices *fs_device
generation = btrfs_super_chunk_root_generation(disk_super);
level = btrfs_super_chunk_root_level(disk_super);
chunk_root->node = read_tree_block(fs_info,
btrfs_super_chunk_root(disk_super),
BTRFS_CHUNK_TREE_OBJECTID,
generation, level, NULL);
if (IS_ERR(chunk_root->node) ||
!extent_buffer_uptodate(chunk_root->node)) {
ret = load_super_root(chunk_root, btrfs_super_chunk_root(disk_super),
generation, level);
if (ret) {
btrfs_err(fs_info, "failed to read chunk root");
if (!IS_ERR(chunk_root->node))
free_extent_buffer(chunk_root->node);
chunk_root->node = NULL;
goto fail_tree_roots;
}
btrfs_set_root_node(&chunk_root->root_item, chunk_root->node);
chunk_root->commit_root = btrfs_root_node(chunk_root);
read_extent_buffer(chunk_root->node, fs_info->chunk_tree_uuid,
offsetof(struct btrfs_header, chunk_tree_uuid),